Round concrete columns incorporate spiral stirrups or ties that engage vertical reinforcement with hooks spaced per structural specifications. Minimum bend diameters scale with bar size, requiring four times the nominal bar diameter for number three through number five bars and six times for number six through number eight bars. Hook extension lengths measure six times the nominal bar diameter for number three through number five bars and twelve times for number six through number eight bars. The circular column profile features typical vertical reinforcement bars enclosed by the rounded tie with a minimum six inch dimension requirement.
STIRRUPS AND TIES #3 - #5 #6 - #8 D 12db FOR #6 - #8 6db FOR #3 - #5 D D D 6db BAR SIZE MIN BEND DIA, D 4db 6db ROUND STIRRUPS AND TIES 6" MIN "db" = NOMINAL BAR DIA IN INCHES, TYP SEE STIRRUP AND TIE DETAIL FOR HOOKS ENGAGE VERT REINF
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